Tim wrote: > > > > The Netapp paper mentioned by JZ > (http://pages.cs.wisc.edu/~krioukov/ParityLostAndParityRegained-FAST08.ppt > > <http://pages.cs.wisc.edu/%7Ekrioukov/ParityLostAndParityRegained-FAST08.ppt>) > talks about write verify. > > Would this feature make sense in a ZFS environment? I'm not sure if > there is any advantage. It seems quite unlikely, when data is > written in > a redundant way to two different disks, that both disks lose or > misdirect the same writes. > > Maybe ZFS could have an option to enable instant readback of written > blocks, if one wants to be absolutely sure, data is written > correctly to > disk. > > > Seems to me it would make a LOT of sense in a WORM type system.
Since ZFS only deals with block devices, how would we guarantee that the subsequent read was satisfied from the media rather than a cache? If the answer is that we just wait long enough for the caches to be emptied, then the existing scrub should work, no? -- richard _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
